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EFI Fuel system question
Hi fellows
As you know I am in the middle of the rework of my car and so I make my thoughts about the fuel system. Do you guys with both stock pumps using with the EFI left the stock check valve at the front pump or removed it? And if removed, any differences when starting? Please share your set-up with me 
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Roland 930 Turbo '81 Too many modifications to list |
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11-18-2012, 03:03 PM
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With my setup I made no changes other than to remove the accumulator and to re plumb the lines in the engine bay to incorporate the new injectors, adjustable pressure valve, and pressure gauge tap.
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Emery 1988 930 coupe - Silver Metallic TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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11-18-2012, 04:52 PM
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R.I.P.
Join Date: Aug 2009
Location: Nicholson, Ga
Posts: 2,160
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Same here, only removed accu
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11-18-2012, 04:57 PM
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Join Date: Jul 2009
Location: Ontario
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Same here...
just removed accumulator. I have talked to some guys only running 1 pump. (front) Philip
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87 930 GHL/Rarlyl8/Garretson/GT3582R/1 Bar/Wevo shift, mounts/Meth inj/LM-2/Custom Fuchs/Carrera intake manifold/Xtreme Carrera heads P&P/3.4/DR 993SS cams/ Mahl/Pauter/JE/Niresist/ARP/twin COP/8.25:1/KEP stage 2/twin tials/close 2,3,4th. MS3Pro Evo 500+ HP, BTSOMP Dyno
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11-18-2012, 05:24 PM
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Thanks guys
It looks like staying with the check valve is the way to go. Did you stayed with on recommendation or what reason? Wonder if anyone tried without... Maybe I have to make an aluminum version as drilling is a bad idea 
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Roland 930 Turbo '81 Too many modifications to list |
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11-18-2012, 11:25 PM
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I even kept the accumulator.
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87 carmine red 930 | 57k | B6 modified IC | GHL headers | custom exhaust | VEMS EFI | carrera intake w/ flipped TB | LS2 coils | EBC | K27-7200 (soon to be replaced by GTX3071 |
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11-19-2012, 01:47 AM
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R.I.P.
Join Date: Aug 2009
Location: Nicholson, Ga
Posts: 2,160
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The accu is nothing more than a shock absorber. I guess it could stay but not sure of it's flow potential for high horsepower
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11-19-2012, 02:19 PM
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Join Date: Aug 2002
Location: OverlandPark KS (Kansas City)
Posts: 526
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You can eave the check valve in at the front pump and loose the accumulator. No reason to leave it in. It is in place to keep the control pressure resting in the CIS head to aid in not vapor locking and leaving you stranded. EFI will not have that problem and is not necessary. You also don't have to use the front check valve but it is not hurting anything and keeps the pumps primed.
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Stephen 94 3.6Turbo 6-speed AWD |
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11-20-2012, 08:42 AM
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Accumulator has gone since converted to EFI. There is another check valve, which is inside the pump, so I remove the front one for a try if there is any difference. Unfortunatly I can not test earlier than next spring, as you know my car is knocked down
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Roland 930 Turbo '81 Too many modifications to list |
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11-20-2012, 11:42 AM
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Join Date: Aug 2002
Location: OverlandPark KS (Kansas City)
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Shouldn't make much of a difference. You should be able to set the pump prime time in the program.
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Stephen 94 3.6Turbo 6-speed AWD |
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11-20-2012, 06:16 PM
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